Known as: Calcium oxalate dihydrate crystals [Presence] in Stone by Infrared spectroscopy, Calcium oxalate dihydrate crystals:Presence or Threshold:Point in time:Calculus (stone):Ordinal:Infrared spectroscopy, Cristaux d'oxalate de calcium dihydrate:Présence-Seuil:Temps ponctuel:Calcul:Ordinal:Spectroscopie infrarouge